What support can we give here except our advice on how to diagnose a problem and possibly get it repaired?
Our fellow member clearly has a problem that has apparently been made worse by Nikon service. They should fix it. I don't think there is anyone on this forum that can take the camera and fix it. We can just offer the best advice we have.
The poster thought there are a bunch of people here who are arrogant and annoying. Those are his words. I tend to avoid arrogant and annoying people whenever possible. Hence my question.
My advice on a camera with bad focusing, or any other noted defect, has always been: return it, get it fixed, or live with it. Do you have another option that isn't covered by those?